质点的运动方程在直角坐标中的表达形式为<img src="https://static.zxtiku.com/wangke/imgs/topic/1987d5f064078bdabc0a125446a12dac.jpg"/>，则：t =ls到t =2s，时间内质点的位移是：( ) A. <img src="https://static.zxtiku.com/wangke/imgs/topic/e14bfcd7d3701c06c4a67437ea1dc510.jpg"/> B. <img src="https://static.zxtiku.com/wangke/imgs/topic/95597f417457fa1a95c7303621334f7e.jpg"/> C. <img src="https://static.zxtiku.com/wangke/imgs/topic/0a952025e35b3f20cec22ba0c3c745c7.jpg"/> D. <img src="https://static.zxtiku.com/wangke/imgs/topic/37ebe9132dd61d33b90a2e9b682826b3.jpg"/>